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Molecular Basis of Inheritance · Question 165

AIPMT 2000MCQEasy📈 Topic in 75% papers+4−1
1

Length of one loop of B-DNA:

  1. 20 nm.
  2. 10 nm.
  3. 3.4 nm.
  4. 0.34 nm.

Answer

(3) 3.4 nm.

Solution

As per NCERT, the pitch of the B-DNA helix is 3.4 nm (a nm is 10-9 m) and there are roughly 10 bp in each turn.

∴ Length of one turn (loop) = 10 0.34 nm = 3.4 nm (distance between two adjacent base pairs = 0.34 nm).

Answer: (3)

AIPMT 2000

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2

In three dimensional view the molecule of t-RNA is:

  1. E-shaped
  2. L-shaped
  3. S-shaped
  4. Y-shaped
AIPMT 2000
3

Similarity in DNA and RNA:

  1. Both have similar sugar
  2. Both are genetic material
  3. Both have similar pyrimidine
  4. Both are polymer of nucleotides
AIPMT 2000
4

Which is the most important factor for continuity of a species from evolutionary point of view?

  1. Formation of gametes
  2. Synthesis of proteins
  3. Replication of genetic material
  4. None of these
AIPMT 2000

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